Performance Assessment of Commercial MOX Sensors in Elevated Hydrogen and Methane Concentrations

This work evaluates the performance of lowcost, commercially available metal oxide (MOX) gas sensors for measuring high concentrations of reducing gases while focusing on hydrogen (H<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>) and methane (CH<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</inf>) of up to $100 \%$ low explosive limit (LEL). In total, 13 different sensor models from varying manufacturers were compared to select sensor models that could be utilized for reliable gas detection in such environments. After identifying suitable MOX sensors the mathematical model the mathematical model describing the dependence of sensor resistance on gas concentration was examined. Calibration curves were fitted to the data, and two modeling approaches were evaluated. The model demonstrating the best fit was subsequently chosen.